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31.

Epidermis of Hydra contains:

A.	Cnidoblasts only	B.	Chidoblasts and interstititial cells
C.	Cnodoblasts, interstititial cells and epithelia muscular cells	D.	None of these

32.

Tentacles of Hydra are:

A.	4/- 10 and hollow	B.	10/12 - 40 and solid
C.	5/6 - 10 and solid	D.	None of these

33.

Discharge of nematocysts in Hydra depends upon:

A.	Hormones	B.	Proteins
C.	Vitamins	D.	Enzymes

34.

Needle-like process of cnidoblast is called:

A.	Lesso	B.	Cnidocil
C.	Nematocysts	D.	Trichocyst

35.

Hydra is:

A.	Marine, diploblastic and radially symmetrical	B.	Fresh water, diploblastic and radially symmetrical
C.	Marine, riploblastic and bilaterally symmetrical	D.	Fresh water, triploblastic and radially

36.

Tentacles of Hydra help in:

A.	Food capture	B.	Locomotion
C.	Both (a) & (b)	D.	None of these

37.

Tentacles of Hydra are:

A.	Hollow	B.	Solid
C.	Branched	D.	Irregularly arranged

38.

Hydra has no special structures for:

A.	Attachment	B.	Food capture
C.	Respiration	D.	Offence and defence

39.

Often hydra is seen moving upon its tentacles, using them as legs. This is called:

A.	Somersaulting	B.	Gliding
C.	Looping	D.	Walking

40.

Hydra can suddenly contract its body with the help of:

A.	Interstitial cells	B.	Epitheliomuscular cells
C.	Tentacles	D.	Nematoblasts